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Debt Long-term Debt Footnote E (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2001
Mar. 31, 2016
Dec. 29, 2018
Oct. 31, 2018
Dec. 30, 2017
Sep. 30, 2016
Debt Instrument [Line Items]            
Notional amounts of interest rate swaps     $ 5,085   $ 4,966  
3.25% U.S. Dollar Notes Due 2026            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 750        
Debt Instrument, Term   10 years        
Debt instrument, stated interest rate   3.25%        
Debt Instrument, Interest Rate, Effective Percentage     4.00%      
Notional amounts of interest rate swaps       $ 450   $ 300
Unamortized gain (loss) on termination of interest rate swaps     $ 8      
Fair value adjustment for interest rate swaps     $ 22      
7.45% U.S. Dollar Debentures Due 2031            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 625          
Debt Instrument, Term 30 years          
Debt instrument, stated interest rate 7.45%          
Debt Instrument, Interest Rate, Effective Percentage 7.55%